Study on Ultrafine-Grained Sintered Nd–Fe–B Magnets Produced From Jet-Milled HDDR Powders

Autor:	Ling Chen, Jian Liu, Lingwen Cai, Aru Yan, Don Lee, Guangfei Ding, Shuai Guo
Rok vydání:	2015
Předmět:	Jet (fluid) Materials science Alloy Metallurgy Sintering Coercivity engineering.material Microstructure Grain size Electronic Optical and Magnetic Materials Magnet engineering Lamellar structure Electrical and Electronic Engineering
Zdroj:	IEEE Transactions on Magnetics. 51:1-4
ISSN:	1941-0069 0018-9464
DOI:	10.1109/tmag.2015.2437874
Popis:	One effective approach for obtaining high coercivity in sintered Nd-Fe-B magnets is to refine the grain size.[1] Recently, Sagawa and Une have developed He jet milling and pressless sintering technology for producing fine-grained Nd-Fe-B magnets with high coercivity of 2 T.[2] However, it is hard to refine the grain size further because that the size of lamellar structure consisting of Nd 2 Fe 14 B in conventional strip casting (SC) Nd-Fe-B alloys is as wide as 3 μm, which limits the refinement during jet milling process. Thus precursor alloy with fine grain size surrounded by homogeneous Nd-rich phase is a promising option. Nd-Fe-B alloys with a homogeneous micsturcture and an average grain size of about 0.3 μm can be produced by Hydrogenation-disproportionation-desorption-recombination (HDDR) process.[3] Therefore, more attention has been paid to HDDR powders as precursor alloys for jet milling.[4]
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6a943bc8ba69dd188850f58eefb1aa52 https://doi.org/10.1109/tmag.2015.2437874 Zobrazit plný text záznamu